I have a 3rd user that ive been battling to get his 8900 migrated away from desktop redirector and onto BES. Ive tried to tried wireless activation but to no avail. I cannot connect the handset directly to the BES server as its part of a hyper V installion (no USB support - thanks Microsoft!)

check with the carrier of that device to make sure it is PROVISIONED correctly.
this has been documented by someon else here as being the same type of problem where the carrier hadnt provisioned the account with BES service.

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